btrfs: stop passing root argument to __btrfs_del_delalloc_inode()

There's no need to pass a root argument to __btrfs_del_delalloc_inode()
and btrfs_del_delalloc_inode(), we can just pass the inode since the root
is always the root associated to that inode. Some remove the root argument
from these functions.
Reviewed-by: Boris Burkov <boris@bur.io>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/btrfs_inode.h

@@ -447,7 +447,7 @@ noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
 			      u64 *orig_start, u64 *orig_block_len,
 			      u64 *ram_bytes, bool nowait, bool strict);
 
-void __btrfs_del_delalloc_inode(struct btrfs_root *root, struct btrfs_inode *inode);
+void __btrfs_del_delalloc_inode(struct btrfs_inode *inode);
 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,

fs/btrfs/disk-io.c

@@ -4629,7 +4629,7 @@ static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
 		struct inode *inode = NULL;
 		btrfs_inode = list_first_entry(&splice, struct btrfs_inode,
 					       delalloc_inodes);
-		__btrfs_del_delalloc_inode(root, btrfs_inode);
+		__btrfs_del_delalloc_inode(btrfs_inode);
 		spin_unlock(&root->delalloc_lock);
 
 		/*

fs/btrfs/inode.c

@@ -2406,9 +2406,9 @@ static void btrfs_add_delalloc_inodes(struct btrfs_inode *inode)
 	spin_unlock(&root->delalloc_lock);
 }
 
-void __btrfs_del_delalloc_inode(struct btrfs_root *root,
-				struct btrfs_inode *inode)
+void __btrfs_del_delalloc_inode(struct btrfs_inode *inode)
 {
+	struct btrfs_root *root = inode->root;
 	struct btrfs_fs_info *fs_info = root->fs_info;
 
 	if (!list_empty(&inode->delalloc_inodes)) {
@@ -2426,12 +2426,11 @@ void __btrfs_del_delalloc_inode(struct btrfs_root *root,
 	}
 }
 
-static void btrfs_del_delalloc_inode(struct btrfs_root *root,
-				     struct btrfs_inode *inode)
+static void btrfs_del_delalloc_inode(struct btrfs_inode *inode)
 {
-	spin_lock(&root->delalloc_lock);
-	__btrfs_del_delalloc_inode(root, inode);
-	spin_unlock(&root->delalloc_lock);
+	spin_lock(&inode->root->delalloc_lock);
+	__btrfs_del_delalloc_inode(inode);
+	spin_unlock(&inode->root->delalloc_lock);
 }
 
 /*
@@ -2538,7 +2537,7 @@ void btrfs_clear_delalloc_extent(struct btrfs_inode *inode,
 		if (do_list && inode->delalloc_bytes == 0 &&
 		    test_bit(BTRFS_INODE_IN_DELALLOC_LIST,
 					&inode->runtime_flags))
-			btrfs_del_delalloc_inode(root, inode);
+			btrfs_del_delalloc_inode(inode);
 		spin_unlock(&inode->lock);
 	}